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Trade receivables (Details) - BRL (R$)
R$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Subtotal R$ 5,313,095 R$ 5,233,932
Allowance for doubtful accounts (1,376,862) (1,377,209)
Total trade receivables 3,936,233 3,856,723
Current 3,590,432 3,584,287
Noncurrent 345,801 272,436
Private Sector [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 2,865,622 3,039,931
Private Sector [Member] | General And Special Customers [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 2,687,984 2,200,921
Private Sector [Member] | Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 177,638 839,010
Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 1,266,561 1,006,009
Government Entities [Member] | Agreements [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 658,021 374,372
Government Entities [Member] | Municipal [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 598,602 623,601
Government Entities [Member] | Federal [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 9,938 8,036
Wholesale Customers Municipal Governments [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 88,745 49,676
Wholesale Customers Municipal Governments [Member] | Mogi Das Cruzes [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 4,134 4,343
Wholesale Customers Municipal Governments [Member] | Sao Caetano Do Sul [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 8,109 45,333
Wholesale Customers Municipal Governments [Member] | Sao Caetano Do Sul Agreement [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 76,502
Unbilled Supply [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal R$ 1,092,167 R$ 1,138,316